This is the 8735th most frequent Portuguese word.
alternar
To switch or alternate between two or more things.
Here, 'alternar' is used to mean changing or toggling settings or states on a device.
Você pode alternar os modos desta máquina para funções diferentes.
You can alternate the modes of this machine for different functions.
In this sentence, 'alternar' refers to the act of switching between two options regularly or periodically.
Eu gosto de alternar entre ler ficção e não-ficção.
I like to alternate between reading fiction and non-fiction.
In this context, 'alternar' indicates the action of varying or turning between different choices in a sequence.